Snap channels for 4.x missing?

Description

I would like to migrate my installation of 4.8.1 using tar/etc to snap, but I found out that snap channels for 4.x are missing

The following doesn’t work
sudo snap refresh rocketchat-server --channel=4.x/edge
sudo snap refresh rocketchat-server --channel=4.x/candidate
sudo snap refresh rocketchat-server --channel=4.x/stable
sudo snap refresh rocketchat-server --channel=4.x/beta

Server Setup Information

  • Version of Rocket.Chat Server: 4.8.1
  • Operating System: CentOS 8
  • Deployment Method: tar
  • Number of Running Instances: 1
  • DB Replicaset Oplog:
  • NodeJS Version: v14.18.3
  • MongoDB Version: 4.2.24
  • Proxy: nginx
  • Firewalls involved: None

Any additional Information

Studied the codes and found out that it is using curl to get lastest version from the following
https://releases.rocket.chat/latest/info

Obviously, the link is a dead link

ALL release links are completely down!